A study on an optimal exercise intensity for enhancing peripheral circulation.

本研究的目的是确定在运动过程中增强外周循环的最佳运动强度。训练包括力竭动态握力，频率为60%收缩/分钟，每周进行5天，持续6周。实验结果如下：1.将18名18~19岁女性随机分为训练组(T组)和对照组(C组)。30%MVC训练后，T组收缩次数明显增加。力竭运动后即刻血流量无明显变化。C组循环参数无明显变化。5名女性的右前臂参加20%MVC的训练，左前臂作为对照。训练后收缩次数明显增加，前臂峰值血流量由训练前的24.3±3.1ml/100ml/min增加到训练后的31.1±3.2ml/100ml/min。结果表明，30%MVC训练可以在不增加血供的情况下提高肌肉耐力，而20%MVC训练则有利于提高氧输送能力。

The purpose of the present study was to determine an optimal exercise intensity to enhance peripheral circulation during exercise. The training consested of an exhausting dynamic handgrip at a frequency of 60% contractions/min, conducted 5 days/week for 6 weeks. The load applied corresponded to 20% and 30% MVC.The results obtained were summarized as follows ; 1. Eighteen women aged 18-19 yrs were divided into 2 groups ; training group (T group) and control group (C group). After training at 30% MVC, the number of contractions in T group increased significantly. The blood flow immediately after exhausting exercise did not change significantly. In C group, no significant changes in the circulatory parameters were observed.2. The right forearms of 5 women participated in the training at 20% MVC and the left forearms served as control. The number of contractions increased significantly after training, accompanied by augmented peak blood flow in the trained forearm from 24.3(〕SY.+-.〔)3.1 ml/100ml/min (pre-training) to 31.1(〕SY.+-.〔)3.2 ml/100ml/min (post-training)3. Theses results suggested that the training at 30% MVC could improve musclar endurance without increase in blood supply, while the 20% MVC training would contibute to improve oxygen transport capacity.